操作方法
Date转String 先设置要转换的日期格式，再做格式化，代码如下：SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss"); 注：格式中间可以再插入/、-、:等日期时间分隔符Date date = new Date();String str = sdf.format(date);System.out.println("date="+date+", str="+str);
String转Date SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");String str = "20160927082630";Date date = sdf.parse(str);System.out.println("date="+date+", str="+str);
Date转Calendar Calendar calendar = Calendar.getInstance();Date date = new Date();calendar.setTime(date);System.out.println("date="+date+", calendar="+calendar);
Calendar转Date Calendar calendar = Calendar.getInstance();Date date = calendar.getTime();System.out.println("date="+date+", calendar="+calendar);